Humidifier



FIG. 1 is a front perspective view of a humidifier of our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is back elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is bottom view thereof.

The broken lines in the drawings are for the purpose of illustrating elements of the humidifier that form no part of the claimed design. 

CLAIM The ornamental design for a humidifier, as shown and described. 